Problem laurell-R SNF 2012-02-29 16:16:15: lid o-ring leaking at screw at "12 o'clock"

[lindaw at snf.stanford.edu]

the lid O-ring is leaking at the screw at 12 o'clock.  When I put tape over the hole to get a uniform spin, the vacuum is sucking in air past the leaking O-ring.